onDestroy() 在操作栏上的后退按钮被按下时调用

Question

我有两个活动，第一个包含一个 ListView of hotel list and the second one is a RecyclerView 用于显示详细信息。

当我使用我的硬件后退按钮按下它时我没有遇到问题 activity 正常恢复，ListView 仍然存在但是当我按下 ActionBar 和 onDestroy 上的后退按钮时我得到了 NullPointerException () 被调用。

如何防止在单击操作栏上的后退按钮时调用 onDestroy()？

编辑：
这是生命周期的 logcat :
1.搜索结果初始化（）

11-21 14:36:45.872 3037-3037/com.agranirwa.travel E/ActivityState: onStart()事件中 11-21 14:36:45.882 3037-3037/com.agranirwa.travel E/ActivityState: onResume()事件中 </pre> <p>

当 ListView 项被选中时

11-21 14:37:55.922 3037-3037/com.agranirwa.travel E/ActivityState: onPause()事件中 11-21 14:37:56.602 3037-3037/com.agranirwa.travel E/RecyclerView：未连接适配器；跳过布局 11-21 14:37:56.732 3037-3037/com.agranirwa.travel E/RecyclerView：未连接适配器；跳过布局 11-21 14:37:56.982 3037-3037/com.agranirwa.travel E/ActivityState：在onStop()事件中 </pre> <p> 3.硬件反压时

11-21 14:38:14.562 3037-3037/com.agranirwa.travel E/ActivityState: onRestart()事件中 11-21 14:38:14.562 3037-3037/com.agranirwa.travel E/ActivityState：在onStart()事件中 11-21 14:38:14.562 3037-3037/com.agranirwa.travel E/ActivityState: onResume()事件中 </pre> <p> 4. 当 actionbar 被按下时


11-21 14:40:15.052 3037-3037/com.agranirwa.travel E/ActivityState: Activity is Finished
11-21 14:40:15.052 3037-3037/com.agranirwa.travel E/ActivityState: In the onDestroy() event
11-21 14:40:15.112 3037-3037/com.agranirwa.travel E/AndroidRuntime: FATAL EXCEPTION: main
                                                                    Process: com.agranirwa.travel, PID: 3037
                                                                    java.lang.RuntimeException: Unable to start activity ComponentInfo{com.agranirwa.travel/com.agranirwa.travel.ui.SearchResultActivity}: java.lang.NullPointerException
                                                                        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2200)
                                                                        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2249)
                                                                        at android.app.ActivityThread.access0(ActivityThread.java:141)
                                                                        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1212)
                                                                        at android.os.Handler.dispatchMessage(Handler.java:102)
                                                                        at android.os.Looper.loop(Looper.java:136)
                                                                        at android.app.ActivityThread.main(ActivityThread.java:5113)
                                                                        at java.lang.reflect.Method.invokeNative(Native Method)
                                                                        at java.lang.reflect.Method.invoke(Method.java:515)
                                                                        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:796)
                                                                        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:612)
                                                                        at dalvik.system.NativeStart.main(Native Method)
                                                                     Caused by: java.lang.NullPointerException
                                                                        at com.agranirwa.travel.ui.SearchResultActivity.onCreate(SearchResultActivity.java:100)
                                                                        at android.app.Activity.performCreate(Activity.java:5242)
                                                                        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
                                                                        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2164)
                                                                        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2249) 
                                                                        at android.app.ActivityThread.access0(ActivityThread.java:141) 
                                                                        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1212) 
                                                                        at android.os.Handler.dispatchMessage(Handler.java:102) 
                                                                        at android.os.Looper.loop(Looper.java:136) 
                                                                        at android.app.ActivityThread.main(ActivityThread.java:5113) 
                                                                        at java.lang.reflect.Method.invokeNative(Native Method) 
                                                                        at java.lang.reflect.Method.invoke(Method.java:515) 
                                                                        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:796) 
                                                                        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:612) 
                                                                        at dalvik.system.NativeStart.main(Native Method)

Answer 1

也许您在 ActionBar 中的后退按钮有问题，您应该真正添加您的实际代码或实施此解决方案

初始化ActionBar后添加

actionBar.setHomeButtonEnabled(true);

然后添加以下内容

@Override
public boolean onOptionsItemSelected(MenuItem menuItem)
{       
    switch (menuItem.getItemId()) {
        case android.R.id.home:
            onBackPressed();
            return true;
        default:
            return super.onOptionsItemSelected(menuItem);
    }
}

onDestroy() 在操作栏上的后退按钮被按下时调用

onDestroy() called when backbutton on actionbar is pressed

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ondestroy

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